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3D Films and Post Production

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Hey guys.


Ok, so I know you need two cameras to simulate the human eyes perspective when filming for a 3D film.

But what I'm trying to figure out is how and what you must do in post production with the footage so it creates a 3D image. When I took my 3D glasses off in the cinema while watching "Bolt", it seems they make the left and right footage 50% opaque over each other.

So I put my theory to the test. I kept my glasses from bolt and I went on Cinema 4D made a simple animation of 3D text spinning around 360 degrees. I used two cameras and put them at approximately eyes length apart. Rendered the left and right image. Then on After Effects I made the left and right footage opaque by 50%. This looked similar to what bolt looked like without my glasses on, but sadly nothing happen. No 3D.

So I researched it on google to see how others do it, and all I found was that people bring out the red channel in the left footage and the blue channel in the right, or vise-versa, then they make both sides opaque by 50% (i think). Anyways you end up with a picture like this.

3D-anaglyph-France-Sacre-Coeur-Basilica-Paris.png


With the glasses I'm using, I didn't pick up anything 3D. I think thats because I'm not using the kind of 3D glasses with blue and red cellophane or what ever they use. So now I assume there are two types of 3D.

I really want to find out how to create a 3D Image(s) using these 3D Glasses (these are not the exact same 3D glasses I'm using however it's the same brand and same theory I think):

realdce5glasses_trans_350.gif


Also I want to know exactly how these glasses work, and how it differs from the old 3D technique i described above. Cheers guys :D:D:D
 
RealD uses circular polarization (as opposed to linear).

Left hand for one eye, right hand for the other. This way it doesn't matter if you tilt your head from side to side.

The screen is called the silver screen for a reason, it has strands of silver throughout it to reflect light better. Metallic objects keep polarization of polarized light, so the metallic silver screen works perfect for this technology.

The RealD projectors are equipped with "Z Screens" that are synced with the video source. This screen when the left eye image is shown, polarizes the light that passes through it the proper polarization direction. It then flips with the corresponding image for the opposite eye.

If you'd really like to get into it, RealD has released white papers that explain it.
 
Right now there are over half a dozen techniques to display 3D. They all have in common that you need to somehow show two different images, one for each eye, at the same time.

Anaglyph, spectral separation, linear polarization, circular polarization, shutter glasses, lenticular screens... Just google them, there are numerous white papers out there.

What you have above is an anaglyph. It works fine with my old red/cyan goggles. :)

See also the 3D section on reduser: http://www.reduser.net/forum/forumdisplay.php?f=49
 
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